Abstract: The trust has long competed with the corporation as a form of business organization. Although today the corporate form dominates the trust for the organization of operating enterprises, the trust dominates the corporation in a handful of specialized niches. The market value of these niches measures in the trillions of dollars. Yet the modern business trust has only recently begun to be subjected to scholarly inquiry. Accordingly, this essay outlines a research agenda for the study of the trust -- in particular, the modern statutory business trust -- as a form of business organization.